<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">hello</div>

    <script>
        let app = document.getElementById('app')

        app.style.position = 'relative'
        
        app.style.width = '100px'
        app.style.height = '200px'
        app.style.left = '10px'
        app.style.top = '10px'

        console.log(app.offsetTop);
        console.log(app.offsetWidth);
        console.log(app.offsetHeight);
        console.log(app.offsetLeft);
        // app.style.cssText = 'width:100px;height:200px;left:10px;top:10px;position:relative;'

    </script>
</body>
</html>